var createError = require('http-errors')
var express = require('express')
var path = require('path')
var cookieParser = require('cookie-parser')
var logger = require('morgan')

// var indexRouter = require('./routes/index');
// var usersRouter = require('./routes/users');
var UserRouter = require('./routes/UserRouter')
var StudentRouter = require('./routes/StudentRouter')
var CourseRouter = require('./routes/CourseRouter')
var TeacherRouter = require('./routes/TeacherRouter')
var ScoreRouter = require('./routes/ScoreRouter')
var MailRouter = require('./routes/MailRouter')
const JWT = require('./util/JWT')

var app = express()

// view engine setup
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'jade')

app.use(logger('dev'))
app.use(express.json())
app.use(express.urlencoded({ extended: false }))
app.use(cookieParser())
app.use(express.static(path.join(__dirname, 'public')))

// app.use('/', indexRouter)
// app.use('/users', usersRouter)
app.use((req, res, next) => {
  if (req.url === '/api/user/login') {
    // 登录接口直接放行
    next()
    return
  }
  const token = req.headers['authorization'].split(' ')[1]
  if (token) {
    const payload = JWT.verify(token)
    // console.log(payload)
    if (payload) {
      // 如果token有效，next()
      const newToken = JWT.generate(
        {
          _id: payload._id,
          username: payload.username
        },
        '1d'
      )
      res.header('Authorization', newToken)
      next()
    } else {
      // 如果token过期，返回401错误
      res.status(401).send({ errCode: '-1', errorInfo: 'token过期' })
    }
  }
})

app.use(UserRouter)
app.use(StudentRouter)
app.use(CourseRouter)
app.use(TeacherRouter)
app.use(ScoreRouter)
app.use(MailRouter)

// catch 404 and forward to error handler
app.use(function (req, res, next) {
  next(createError(404))
})

// error handler
app.use(function (err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message
  res.locals.error = req.app.get('env') === 'development' ? err : {}

  // render the error page
  res.status(err.status || 500)
  res.render('error')
})

module.exports = app
